Gabriel: You and Elizabeth are going to have a son.
Zach: How? We're too old.
Gabriel: Do you know who I am and what I do? Here's a few months of muteness to persuade you not to argue with an angel next time.
Gabriel appears to have gotten angry when he did this, so now I'm picturing the conversation between him and God.
God: go tell Zacharia what's happening.
Gabriel: He won't believe me.
God: (grinning and winking) Convince him.
Gabriel: Yes, SIR!